Mobil™ HyJet™ V

View all Hydraulic fluids

Aircraft component of hydraulic system

The first Type V phosphate ester hydraulic fluid to be used in service on Airbus and Boeing aircraft, Mobil HyJet V has logged more than 10 million in-service hours in more than 2,500 aircraft since its introduction in 2008.

Compatible with all approved Type IV and Type V hydraulic fluids, elastomers and other hydraulic system materials, Mobil HyJet V is a fire-resistant phosphate ester hydraulic fluid that can help mixed fleets extend the life of hydraulic systems.

Mobil HyJet V is fully approved in all commercial 5000 psi hydraulic pressure aircraft systems. Reasons to trust in Mobil HyJet V

Reasons to trust in Mobil HyJet V

  1. Mobil HyJet V offers more than twice the shelf life of Type IV fluids, helping operators extend fluid life.
  2. It helps reduce fuel consumption and costs with its low-density formulation.
  3. Helps maximize component life and reduce maintenance costs with its exceptional protection against wear, corrosion, erosion and deposit control.
  4. Gives operators a high measure of safety and confidence with its exceptional resistance to flammability, which exceeds Grade A flash point specifications of air framers such as Airbus and Boeing.
  5. Maintains outstanding performance, stability and viscosity in a wide range of temperatures. 

Contact an expert
Send to a colleague

Product Information

   Mobil HyJet™ V performance profile 1.55 MB/pdf
Download Send to a colleague
   Mobil HyJet™ V success story 1.487 MB/pdf
Download Send to a colleague


Aviation lubricant shelf life

Find out the recommended shelf life of ExxonMobil aviation lubricants.

English, Technical topics

Storage and handling recommendations and best practices

Applying the first-in, first-out (FIFO) inventory method can help reduce the risks of oil and grease deterioration caused by lengthy storage. Learn more.

English, Technical topics

Features and benefits

Mobil HyJet V offers the following key features and benefits:
Advantages and Potential Benefits
Higher stability than Type IV fluids Longer fluid life,
Lesser need to replace fluid due to degradation,
Reduced hydraulic system maintenance costs
Meets Boeing BMS 3-11 and SAE AS1241 Type IV and Type V requirements Improved flammability characteristics over meeting just the Type V requirements
Low density Reduced weight of the hydraulic fluid carried by aircraft,
Reduced aircraft fuel consumption,
Lower operating costs
Excellent rust protection Reduced risk of equipment damage in the event of major water contamination
Excellent low and high temperature viscosity balance Precise hydraulic system control and response even during extended range/polar flights,Longer aircraft hydraulic system equipment life
Excellent deposit control Longer aircraft hydraulic system equipment life,Reduced maintenance costs
Improved protection against electro-chemical corrosion (erosion) Protection against servo valve and pump damage
Fully compatible with all approved Type IV and Type V phosphate ester hydraulic fluids Flexibility in use by airline operators


Mobil HyJet V is designed for use in commercial aircraft phosphate ester hydraulic systems. It meets the SAE AS1241 requirements and is included in commercial and business airframe manufacturer Qualified Products Lists, as shown below. It is compatible in all proportions with commercial Type IV and Type V phosphate ester aviation hydraulic fluids.

Specifications and approvals

Mobil HyJet V
Is In Qualified Products List
Airbus (NSA 307110N Type V) X X
ATR (NSA307110N Type V) X X
Boeing (All fleets including B787) X X
Boeing (BMS 3-11P Type V, Grade A & C) X X
Boeing-Long Beach (DMS 2014H Type 5) X X
Bombardier (C Series) X X
Embraer X X
Fokker (SL050) X X
Gulfstream (1159SCH302J Type V) X X
SAE Aerospace Standard (AS1241D) X X
SAE Aerospace Standard (AS1241 Type V) X Not Applicable

Typical properties

Test Method
Mobil Hyjet V
Kinematic Viscosity, cSt ASTM D 445

at -53.9ºC (-65ºF)

1350 2000 max
at -26.1ºC (-15ºF)

132 135 max
at 37.8ºC (100ºF)

10.6 10.0 -11.0
at 98.9ºC (210ºF)

3.6 3.35 - 3.75
at 127.6ºC (260ºF)

2.6 1.5 min
Viscosity Index ASTM D 2270 280

Shear Stability, % Viscosity Drop at 40ºC ASTM D 5621 21

Pour Point, ºC (ºF) ASTM D 97 ‹-62 (-80) -62 (-80) max
Specific Gravity at 25ºC/25ºC (77ºF/77ºF) ASTM D 4052 0.997 0.991 -1.003
Density at 15.6ºC (60ºF), g/mL (lb/gal) ASTM D 4052 1.000 (8.35)

Acid Number, mg KOH/g ASTM D 974 0.04 0.1 max
Water, Karl Fischer, mass % ASTM D 6304 0.09 0.2 max

Flash Point, ºC (ºF) ASTM D 92 174 (346) 160 (320) min
Fire Point, ºC (ºF) ASTM D 92 186 (366) 177 (350) min
Autoignition Point, ºC (ºF) ASTM D 2155 ›427 (800) 400 (752) min
Foaming Tendency/Stability, mL foam/sec to collapse ASTM D 892

Sequence I

32/18 250/100 max
Sequence II

23/13 150/50 max
Sequence III

34/19 450/250 max
Particle count, NAS 1638 Class Auto Counter 4 7 max
Chemical Elements, ppm


4 20 max

38 48 max

10 50 max

1 15 max

51 200 max
Four-Ball Wear, Scar diameter at 75ºC/600rpm/1hour, mm Modified ASTM D 4172

4 kg

0.21 0.45 max
10 kg

0.26 0.50 max
40 kg

0.63 0.55 – 0.85
Electrical Conductivity at 20ºC, microSiemens/cm

0.4 0.3 min
Bulk Modulus, Isothermal secant at 100ºF/3000 psi, psi


Thermal Conductivity at 40ºC, cal/sec/cm2/ºC (Btu/hr/ft2/ºF)

33x10^-5 (0.0799)

Coefficient of thermal expansion, 25 to 100ºC, per ºC (per ºF)

0.00086 (0.00048)

Specific Heat Capacity at 40 ºC, cal/g/ºC (same as Btu/lb/ºF)


(1) Values may vary within modest ranges

  • Airbus
  • Boeing
  • Bombardier - Cseries
  • COMAC (Commercial Aircraft Corporation of China)
  • Fokker
  • Gulfstream
  • Maximize component life
  • Extended fluid life
  • Low density
  • Rust protection
  • Extended temperature range
  • Deposit control
  • Erosion protection
  • Corrosion protection
  • Fire-resistance
  • SAE AS1241
  • Airbus / ATR NSA 307110N
  • Boeing BMS 3-11P Type V, Grade A and Grade C
  • Boeing-Long Beach DMS 2014H Type 5
  • Gulfstream 1159SCH302J
  • Fokker (SL050)
  • Type V
  • Exxcare hydraulic systems oil analysis

  • Diagram of oil flow on gears

    Mobil Jet™ Oil 387

    Mobil Jet Oil 387 has been developed to meet the performance requirements of both current and future, advanced gas turbine engines used in commercial and military service.

    Learn More
  • Airplane tires in a warehouse

    Mobil™ Aviation Grease SHC™ 100

    Mobil Aviation Grease SHC 100 is a supreme performance synthetic grease which combines the unique features of a polyalphaolefin (PAO) synthetic base fluid with those of a high quality lithium complex soap thickener. The thickener system provides a high dropping point, excellent resistance to water wash, and a tenacious structural stability.

    Learn More
  • Blue sky view from the side of a plane


    Find answers to general ExxonMobil aviation questions or explore our other FAQ pages about jet turbine oils, hydraulic fluids, piston engine oils, greases and gear oils.

    Learn More